A Stormy Pig Bag (嵐の山の怪, Arashi no Yama no Ayashii, lit. Mystery of the Stormy Mountain) is an event in Tomba!.
Obtain the Red Evil Pig Bag.
The event is automatically activated when Tomba enters Phoenix Mountain for the first time.
It can be found behind the door with the large keyhole in the second part of Phoenix Mountain.